Sound-reproducing apparatus



July 2, 1929. A. LursKY SOUND REP RODUCING APPARATUS Filed oct. 15, 192ej INVENTOR daran Sluisky' ATTORNEY Patented July 2, 1929.

l UNiTEDsTATi-.sf

AARON sLU'rsxm'oF NEW Yonx, ity..

SOUND-REPRODUCING APPARATUS.

Appiication ined octoberis, 192s. seriai No. 141,685.y

This invention relates to sound-reproducing apparatus more particularlyintended for use in connection with phonographs and has for its objectto provide means for repro-A ducing sounds which will be simple andcheap in construction and yet atthe same time be free from harshmetallic sounds and produce a louder, purer and clearer tone thanheretofore.

the invention consists in a combined soundbox or"reproducer and hornconstructed, in compact form, of strawboard, cardboard or similarmaterial and impregnated with vlacquer or shellac which I have foundincreases the tonal qualities of the material and gives a reall pleasingreproduction.

In tlie accompanying drawings Figure 1 is a front view of one embodimentof the apparatus constructed according to the present invention.

Fig. 2 is an end View thereof, and, y

Fig. 3 is a similar View to Figure 1 but showing the sound-box insection and a horn of modified shape. i Referring more particularly toFig. 3 of the drawingsthe sound-box according to the present inventionis built-up from a pluralityrof layers of cardboard, strawboard or likematerial interposed between which is the usual diaphragm 6 of mica orother suitable material, the external shape of the particu* larsound-box illustrated being hexagonal.

On either side,r of the diaphragm 6 areprovided the usual protecting andretaining rings. 8 of rubber forthe diaphragm.r

Aroundthe diaphragm6 and rings 8 are disposed the various layers ofcardboard or the likefwhich are used according to the present inventionto build up the sound-box, these; comprising f i' (a) Several layers l0disposed outside or beyond the diaphragm 6 and rings 8, these layersbeing provided with large centrallydisposed circular openings to receivesaid diaphragm and rings;

(b) Two layers 12 and 14 disposed one on either side of the layers 10and having smaller central openings 16, the greater amount of materialleft serving to hold by compression the diaphragm and rings irmly in'place as will be clear from an inspection of Fig. 3.

(c) A layer 18 outside of the 'layer 12 provided with a smaller centralopening 22 to which layer is secured in any suitable man- With the aboveand other objects in view` nerafsocket'24 by which the sound-box can Abe connected to the usual vtone arm 25 of a phonograph v.or be otherwisesupported in correct relation to a record to be played.

(d) A layer 2O having asmall central square opening 26 adapted toreceive and hold a further and preferably squared socket 28 jwhich inturn is adaptedto receive' and" hold, as by a screw 30, a small horn 32which may be used supplemental to the usual horn with which a machine isprovided or independent thereof. However, the horn 32 may be dispensedwith,.the socket 28 acting in such case in lieu thereof. i

The various layers of material formingv the sound-box above describedare suitably glued or cemented one tothe other and are preferably boundon the outside by layers of paper 34, or the exposed surfaces of thecardboard layers before the paper is applied may be impregnated withshellac, for the purposes and with the objects hereinbefore mentioned. Asuitable lacquerfor the purpose is one consisting of a solution of about20 per cent amyl acetate and about 80 per cent acetone solutionofnitrocellulose, which on drying forms a layerof cellulose material.

This solution prevents. the box from ab.- sorbing any sound as all thepores thereof are closed theiebyand the entire sounds reproducedarevtherefore conveyed Afrom the box through the horn.` It alsohardensi'the entire box to such an extent lthat it`takes the place of ametal box in its hardness.

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It will be'observed thatthe outer layers 18` and 20practicallycompletely shield the diaphragm 6. f v y v The horn 32 isalso made of one or more layers of cjardboard'suitably sha ed, coveredwith paper andimpregnated witi lacquer in ,y

the sameina'nner 'as the sound-box.'

To the diaphragm 6 is connected, as by a screw 36, the stylus bar 38which at'its outer end merges into the transverse plate or bar 40 fromthe centre of which depends the stylus holder 42. It will be noted thatthe layer 20 is provided with an elongated slot 52 to permit the rod 38to reach the diaphragm 6.

About the lowermost part of the sound-box is disposed a `Ushaped metalbracket 44 se- Cured in place by screws 46 which pass through holestapped therethrough and through the various layers of material formingthe sound-box. These screws also hold in place the springs 48 which inturn fulcrum the bar 40 against the downwardlyprojecting pins orknife-edges 50 with which the bracket 44.- is provided.

What I claim is l. Sound-reproducing apparatus comprising a diaphragm, aplurality of annular layers of cardboard enclosing said diaphragm andforming a sound box, saidV layers being cemented'one to the other andthe sound boxV being lacquered on its exposed surfaces, a

`horn carried by one of the said layers of cardboard and means forconveying vibrations to said diaphragm.

2. Sound-reproducing apparatus for phonographs comprising a diaphragm, aplui, rality of layers of cardboard enclosing said diaphragm and forminga sound box, said layers being cemented together and the sound box beinglacquered on its exposed surfaces, means for conveying vibrations tosaid diaphragm, a horn formed of lacquered cardboard, means carried byone of the outer layers enclosing the diaphragm for supporting saidhorn, and means Vcarried by the other outer layer enclosing thediaphragm for connecting the apparatus to a phonograph.

3. A sound-box for phonographs comprising a diaphragm, positioning ringsencircling said diaphragm circumferentially at either side thereof, alayer of cardboard on the outer side of each of said rings and pressingthereon to retain the same and the diaphragm in position, an outer layerof cardboard on Vthe outer side of each of said last-mentioned layers,all of the layers hereinbefore mentioned being cemented to form tionwith centrally-disposed openings of various sizes, a horn connected toand carried by one of the said layers of carboard, means for conveyingvibrations to the diaphragm, and means for connecting the sound-box to aphonograph.

5. A soundbox for phonographs comprising a diaphragm, suspension ringsdisposed circumferentially on either side thereof, a plurality of layersof cardboard cemented togetherenclosing and retaining said diaphragm andrings and of disc-like formation with centrally-disposed openings ofvarious sizes, means for conveying vibrations to the diaphragm, meansfor connecting the soundbox to a phonograph mounted at one side of saidbox and a horn carried by the layer of cardboard at the opposite side ofsaid soundbox. I

6. A sound-box for phonographs comprising a diaphragm, suspension ringsdisposed circumferentially on either side thereof, a plurality of layersof cardboard cemented together enclosing and retaining said diaphragmand rings and of disc-like formation with centrally-disposed openings ofvarious sizes, means for conveying vibrations to the diaphragm, meansfor connecting the soundbox to a phonograph mounted at oneside of saidbox and a horn, also of cardboard and lacquered, carried by the layer ofcardboardat the opposite side of said sound-box.

7. A sound-box for phonographs comprising a diaphragm, a plurality oflayers of cardboard enclosing said diaphragm, said layers being cementedone to the other, a horn secured to and carried by one of said layers ofcardboard, an elongated slot in one of said layers, a stylus barconnected to said diaphragm and passing through said elongated slot, atransverse member formed integral with said bar at its outer end, astylus holder depending from said member, a U-shaped bracket disposedabout the lowermost part of said sound-box, and carrying fulcrum pinsand springs for said transverse member.

In testimony whereof I have signed my name to this specification.

AARON 'sLUrsxx

